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Eric Arby was the assistant to Professor Greer.
He is a Caucasian male with orange hair and wears glasses.
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The Scooby-Doo Show
He was prowling around in a fake laboratory in the basement when Fred and Daphne found him. He said he had run off when the Mantis first appeared, but now he was back to check things out. They considered him a likely suspect to be the Mantis. (The Creepy Creature of Vulture's Claw)